KR100465126B1 - Solenoid-Operated Valve - Google Patents

Abstract

The solenoid valve is formed of an elastic material such as rubber, and includes first and second elastic ring bodies 68a and 68b that hold the periphery of the diaphragm 50 and are bent according to the displacement of the diaphragm 50. A pair of lip portions 70a and 70b are formed in the first and second elastic ring bodies 68a and 68b.

Description

Solenoid Valve {Solenoid-Operated Valve}

The present invention relates to a solenoid valve capable of improving the durability of the diaphragm by reducing the load on the root portion of the diaphragm for opening and closing the fluid passage.

Background Art Conventionally, solenoid valves for controlling the flow direction of compressed air have been used, for example, by supplying compressed air to an actuator or by evacuating compressed air into air. As the solenoid valve, a method of operating the valve plug by a solenoid (electromagnet) is generally adopted.

As shown in FIG. 4, the solenoid valve according to the prior art includes a coil housing 4 having a fixed iron core 1, a coil 2, a movable iron core 3 (plunger), and the like, and a pair of fluids. The diaphragm 7 which opens and closes the valve seat 6 communicating between the entry ports 5a and 5b is comprised by the valve body 8 arrange | positioned (refer Unexamined-Japanese-Patent No. 3-61776).

The diaphragm 7 is composed of a thick film portion 7a landing on the valve seat 6, and a thin film portion 7b formed integrally with the thick film portion 7a, and a peripheral portion of the thin film portion 7b. The edge is fixed to the recessed part 9 of the valve body 8.

In this case, a suction force is generated when the coil 2 is energized, and the movable iron core 3 is displaced by the suction force to operate the diaphragm 7.

However, in the solenoid valve according to the prior art, whenever the diaphragm 7 is displaced integrally with the movable core 3 under excitation or non-excitation with respect to the coil 2, the recess 9 of the valve body 8 is provided. Since excessive load is applied to the vicinity of the periphery (root portion) fixed to the edge, the durability of the diaphragm 7 is significantly degraded.

In addition, by increasing the magnetic flux density by the coil 2, it is necessary to increase the suction action of the coil 2 to increase the responsiveness of the solenoid valve.

An object of the present invention is to provide a solenoid valve capable of improving the durability of a diaphragm by smoothly operating the diaphragm by reducing the load on the root portion of the diaphragm for opening and closing the fluid passage.

In addition, an object of the present invention is to provide a solenoid valve capable of increasing the responsiveness by increasing the suction action of the coil applied to the movable iron core.

1 is a longitudinal sectional view along the axial direction of the solenoid valve according to the embodiment of the present invention;

FIG. 2 is an enlarged longitudinal sectional view of a portion of the diaphragm shown in FIG. 1;

3 is an operation explanatory diagram showing an on state in which the diaphragm is raised by switching from the off state of FIG. 1;

Figure 4 is a longitudinal cross-sectional view of a solenoid valve according to the prior art.

In order to achieve the above object, the present invention provides a solenoid valve for displacing a diaphragm functioning as a valve plug by attracting a movable iron core under excitation of a solenoid, wherein the solenoid valve is formed of an elastic material and supports the periphery of the diaphragm. And, it characterized in that the elastic ring body is bent in accordance with the displacement of the diaphragm is installed.

In this case, the elastic ring body may form a pair of lip portions that are bent in accordance with the displacement of the diaphragm.

In addition, a ring body having a flange portion having an outer circumferential surface may be provided on the lower side of the solenoid, and an annular protrusion portion having a main surface expanded radially outward is formed on the movable core to increase magnetic flux density generated by the solenoid to increase suction force. Can be.

In addition, the elastic ring body may be installed to be maintained in the annular recess formed of the first valve body and the second valve body constituting the solenoid valve body.

According to the present invention, the elastic ring body for supporting the periphery of the diaphragm is bent according to the displacement of the diaphragm under excitation or non-gripping action of the solenoid, so that the load applied to the root portion of the diaphragm is reduced to improve durability. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the solenoid valve of the present invention will now be described in detail with reference to the accompanying drawings.

Reference numeral 10 in Figure 1 represents a solenoid valve according to the embodiment of the present invention.

The solenoid valve 10 includes a pressure fluid supply port 12 mounted at a central portion thereof and a pair of pressure fluid discharge ports 14a and 14b adjacent to the left and right sides with the pressure fluid supply port 12 interposed therebetween. A first valve body 16 and a substantially cylindrical second valve body 18 connected integrally to the upper portion of the first valve body 16 by an annular end 17 are included.

In addition, the solenoid valve 10 has a bottomed cylindrical bonnet 20 integrally connected to one side of the first valve body 16; A solenoid portion 22 disposed inside the bonnet 20; And a valve mechanism part 24 for switching a communication state or a non-communication state between the pressure fluid supply port 12 and the pressure fluid discharge ports 14a and 14b under the excitation of the solenoid part 22.

In addition, a flange portion 26 is formed at a lower portion of the bonnet 20, and the solenoid valve 10 is replaced with another member (not shown) by inserting a bolt (not shown) into the mounting hole (not shown) of the flange portion 26. ) Can be installed. Seal members 28a and 28b are mounted near the pressure fluid supply port 12 and the pressure fluid discharge ports 14a and 14b.

The solenoid portion 22 includes a cap member 32 which is wound inside the bonnet 20 and formed of a cylindrical metal material having a bottom; A bobbin 36 disposed inside the cap member 32 and in which a coil 34 is wound; A fixed iron core 38 having one end connected to the cap member 32; And a movable iron core 42 coaxially disposed with the fixed iron core 38 and pressurized in a direction apart from the elastic force of the first spring member 40 embedded between the fixed iron core 38. do.

An annular projection portion 42b having a main surface 42a is formed on the lower side of the movable iron core 42 in the radially outward direction, and the annular projection portion 42b is fixed in the recessed portion of the plate member (to be described later). Further, at one end of the movable iron core 42, a rod portion 42c protruding downward is formed. In addition, the movable core 42 is formed with a cylindrical hole having a bottom 44, one end is fixed to the first spring member 40, the other end is fixed to the fixed core 38 The perturbing member 46 is provided in a displaceable manner.

The lower side of the coil 34 has a hole portion through which the movable iron core 42 is inserted, and a ring member 48 made of a metallic material is provided to be held by the cap member 32. The ring member 48 is formed with a flange portion 48b having a wide outer circumferential surface 48a along the inner wall surface of the cap member 32.

Between the bonnet 20 and the cap member 32, a substrate 49 including an over-exciting circuit is disposed. This over-exciting circuit is composed of a CR circuit in which a capacitor and a resistor (not shown) are connected in parallel, and functions to amplify a voltage applied to the coil 34.

The valve mechanism 24 is formed of a resin material such as, for example, a fluororesin, and is integral with the thick film portion 50a connected to the rod portion 42c of the movable iron core 42 and the thick film portion 50a. Diaphragm 50 made of a thin film portion (50b) formed of; A plate member 54 connected to the lower side of the movable iron core 42 and installed integrally with the movable iron core 42 in a displaceable manner, and having an annular protrusion 54a functioning as a stopper; A displacement member 56 mounted to the thick film portion 50a of the diaphragm 50; An elastic member 58 embedded between the displacement member 56 and the diaphragm 50 and formed of an elastic material such as rubber to protect the thin film portion 50b; And a second spring member 60 interposed between the ring body 48 and the displacement member 56.

The diaphragm 50 is landed with respect to the landing portion 62 formed in the first valve body 16, or is separated from the landing portion 62 by the pressure fluid supply port 12 and the pressure fluid discharge port 14a, 14b ), A passage 64 communicating with each other can be opened and closed.

In the annular recess 66 formed in the first valve body 16 and the second valve body 18, for example, a first elastic ring body 68a and a second elastic ring body 68b formed of an elastic material such as rubber are provided. Maintained in one piece.

As shown in FIG. 2, a peripheral portion of the thin film portion 50b of the diaphragm 50 is sandwiched between the first elastic ring body 68a and the second elastic ring body 68b, and the first and second elastic ring bodies are sandwiched. The pair of ring portions 70a and 70b of the 68a and 68b are bent integrally with the thin film portion 50b of the diaphragm 50 to thereby hold the diaphragm held by the first and second elastic ring bodies 68a and 68b. The load on the root portion 72 of 50 can be reduced.

In other words, the diaphragm can be restrained by restraining the load applied to the root portion 72 holding the diaphragm 50 by providing spring characteristics to the lip portions 70a and 70b of the first and second elastic ring bodies 68a and 68b. The durability of the 50 can be improved.

Each of the pair of lip portions 70a and 70b has a thin film portion protruding along the inner diameter direction with a predetermined length from the first and second elastic ring bodies 68a and 68b held in the annular recess 66. One end of the lip portions 70a, 70b is provided substantially flat with the inner wall surface of the second main body 18 mounted thereon (see Fig. 2).

As shown in FIG. 2, a plurality of protrusions 74 having a sealing function in contact with the periphery of the diaphragm 50 are formed inside the first and second elastic ring bodies 68a and 68b. In addition, wave-shaped sections 76 formed in the first and second elastic ring bodies 68a and 68b may be formed when the first and second elastic ring bodies 68a and 68b are held in the annular recess 66. It acts as a relief.

Further, the first and second elastic ring bodies 68a and 68b may be formed integrally without being separated from each other. In addition, the spring force of the second spring member 60 may be set to be greater than the spring force of the first spring member 40.

The solenoid valve 10 according to the embodiment of the present invention is basically configured as described above, and then its operation and effect will be described.

1 shows a non-excited state in which no current is supplied to the coil 34, and the diaphragm 50 is landed on the landing portion 62, so that the pressure fluid supply port 12 and the pressure fluid discharge ports 14a and 14b are provided. Indicates an off state in which communication between them is blocked.

The coil 34 is energized by applying power (not shown) to the coil 34 in the off state as described above, and the movable core 42 is attracted to the fixed core 38 by the excitation action, and FIG. 3. As shown in the figure, the solenoid valve 10 is switched from the off state to the on state.

That is, the movable iron core 42 is displaced by a minute distance toward the fixed iron core 38 in response to the spring force of the first and second spring members 40 and 60, and the plate member 54 and the displacement member 56 are It moves up integrally with the movable iron core 42. At that time, the annular projection 54a of the plate member 54 functioning as a stopper abuts against the ring body 48 to become the displacement end position.

Therefore, the diaphragm 50 is separated from the landing portion 62 under the displacement action of the movable iron core 42, so that the pressure fluid supply port 12 and the pressure fluid discharge ports 14a and 14b, as shown in FIG. It is in a connected on state. As a result, the pressure fluid introduced from the pressure fluid supply port 12 passes through the gap between the diaphragm 50 and the landing portion 62. In addition, pressure fluid is supplied to the fluid apparatus (not shown) through the passage 64 and the pressure fluid discharge ports 14a and 14b.

In this embodiment, the peripheral portion of the thin film portion 50b of the diaphragm 50 is sandwiched between the first elastic ring body 68a and the second elastic ring body 68b formed of an elastic material such as rubber, and the first and second The pair of lip portions 70a and 70b of the elastic ring bodies 68a and 68b are bent integrally with the thin film portion 50b of the diaphragm 50 to be held by the first and second elastic ring bodies 68a and 68b. The load on the root portion 72 of the diaphragm 50 can be reduced.

In other words, the lip portions 70a, 70b of the first and second elastic ring bodies 68a, 68b function as springs, and are flexibly installed in correspondence with the displacement of the thin film portion 50b of the diaphragm 50, thereby providing a diaphragm ( The durability of the diaphragm 50 can be improved by suppressing the load applied to the root portion 72 in which 50 is maintained.

In addition, in the present embodiment, the ring body 48 on which the flange portion 48b having the vast outer circumferential surface 48a is formed on the lower side of the coil 34 is provided, and the main surface (expanded in the radially outward direction to the movable core 42) By forming the annular projection portion 42b having 42a, the magnetic flux density by the coil 34 can be increased, and the suction action of the coil 34 can be increased. As a result, the high speed response of the solenoid valve 10 can be increased.

In other words, the surface area is formed by the main surface 42a formed on the annular projection 42b of the movable iron core 42 made of metal material and the outer circumferential surface 48a formed on the flange portion 48b of the ring body 48 made of metal material. As it increases, the magnetic flux density generated by the coil 34 increases, and the suction force on the coil 34 can be increased.

Further, when the solenoid portion 22 is turned on, a small gap 78 (see FIG. 3) is formed between the fixed iron core 38 and the movable iron core 42, and the fixed iron core 38 and the movable iron core are formed. It is provided so that 42 may not contact. The size along the axial direction of the movable iron core 42 is precisely set in advance so that the clearance 78 is formed between the fixed iron core 38 and the movable iron core 42 in the on state.

Therefore, it is possible to prevent the audible noise between the fixed iron core 38 and the movable iron core 42 to be generated, thereby maintaining the constant temperature. Therefore, the solenoid valve 10 according to the present embodiment can be suitably used in an environment where constant temperature should be maintained, such as a hospital or a sound facility.

In the present embodiment, the first and second elastic ring bodies 68a and 68b for holding the peripheral portion of the diaphragm 50 flexibly are applied to the solenoid valve 10. However, the present invention is not limited thereto. In addition to (10), the present invention can be applied to various valves or fluid pressure equipment such as pressure reducing valves in which various diaphragms are disposed.

According to the present invention, the lip portion of the elastic ring body holding the diaphragm has a spring characteristic, and is flexibly installed in response to the displacement of the diaphragm, so that the load applied to the root portion of the diaphragm is suppressed so that the durability of the diaphragm is suppressed. Can improve.

In the present embodiment, the magnetic flux density generated by the solenoid increases as the surface area is increased by the main surface formed on the annular projection of the movable iron core made of the metal material and the outer surface formed on the flange portion of the ring body made of the metal material. The suction force by the solenoid can be increased.

Claims (10)

In the solenoid valve which displaces the diaphragm 50 which functions as a valve plug by attracting the movable core 42 under the excitation action of the solenoid 22, the solenoid valve is formed of an elastic material, and the diaphragm 50 Retaining the peripheral portion, the elastic ring body that is bent in accordance with the displacement of the diaphragm 50 is installed, The elastic ring body includes a first elastic ring body 68a and a second elastic ring body 68b, and a peripheral portion of the diaphragm 50 is disposed between the first elastic ring body 68a and the second elastic ring body 68b. Intervening. Solenoid valve, characterized in that the first elastic ring body (68a) and the second elastic ring body (68b) is formed with a projection (74) in contact with the periphery of the diaphragm (50). delete delete According to claim 1, wherein the first elastic ring body (68a) and the second elastic ring body (68b) is characterized in that a pair of lip (70a, 70b) is bent in accordance with the displacement of the diaphragm (50) is formed Solenoid valve. The solenoid valve according to claim 1, wherein the first elastic ring body (68a) and the second elastic ring body (68b) are formed with a corrugated portion (76). The lip portions 70a and 70b of claim 4, wherein the lip portions 70a and 70b have a thin film portion protruding radially in a radial direction from the first elastic ring body 68a and the second elastic ring body 68b. The solenoid valve which functions as a spring. According to claim 1, wherein the kettle valve body is composed of a first valve body 16 and the second valve body 18, the elastic ring body is the first valve body 16 and the second valve body (18) The solenoid valve which is hold | maintained in an annular recessed part by this. 2. The main surface of claim 1, wherein a ring body 48 having a flange portion 48b having an outer circumferential surface 48a is provided on a lower side of the solenoid portion 22, and a main surface bulged radially outwardly on the movable iron core 42. The solenoid valve characterized in that the said annular projection part 42b which has 42a is formed. The solenoid valve according to claim 1, wherein the first elastic ring body (68a) and the second elastic ring body (68b) are separated from each other. The solenoid valve according to claim 1, wherein the first elastic ring body (68a) and the second elastic ring body (68b) are integrally formed.